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    <title>FP_CONTRACT, FP_FAST_FMAF, FP_FAST_FMA_HALF</title>
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        <a xmlns="http://www.w3.org/1999/xhtml" id="FP_CONTRACT"></a>
        <h1>FP_CONTRACT, FP_FAST_FMAF, FP_FAST_FMA_HALF</h1>
        <p>
Control expression contraction; fast fma()
        <div xmlns="http://www.w3.org/1999/xhtml" class="informaltable"><table border="0"><colgroup><col align="left" class="col1" /></colgroup><tbody><tr><td align="left">
<div class="literallayout"><p><br />
#pragma OPENCL FP_CONTRACT <code class="varname">on-off-switch</code><br />
<br />
<code class="varname">on-off-switch</code> is one of:<br />
     ON, OFF or DEFAULT.<br />
     The DEFAULT value is ON.<br />
<br />
FP_FAST_FMAF<br />
FP_FAST_FMA<br />
FP_FAST_FMA_HALF<br />
        </p></div>
                        </td></tr></tbody></table></div></p>
      </div>
      <div class="refsect1">
        <a id="fpcontract"></a>
        <h2>FP_CONTRACT</h2>
        <p>
          The <code class="function">FP_CONTRACT</code> pragma takes the form:
        </p>
        <p>
          </p>
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                <td align="left">
#pragma OPENCL FP_CONTRACT on-off-switch
                  </td>
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            </tbody>
          </table>
        </div>
        <p>
        </p>
        <p>
          <code class="function">FP_CONTRACT</code> can be used to allow (if the state is
          <code class="constant">on</code>) or disallow (if the state is <code class="constant">off</code>)
          the implementation to contract expressions. Each pragma can occur either outside
          external declarations or preceding all explicit declarations and statements inside
          a compound statement.
        </p>
        <p>
          The parameter <code class="varname">on-off-switch</code> is one of ON, OFF or DEFAULT. The
          DEFAULT value is ON.
        </p>
        <p>
          When outside external declarations, the pragma takes effect from its occurrence until
          another <code class="function">FP_CONTRACT</code> pragma is encountered, or until the end of
          the translation unit. When inside a compound statement, the pragma takes effect from
          its occurrence until another <code class="function">FP_CONTRACT</code> pragma is encountered
          (including within a nested compound statement), or until the end of the compound
          statement; at the end of a compound statement the state for the pragma is restored
          to its condition just before the compound statement. If this pragma is used in any
          other context, the behavior is undefined.
        </p>
      </div>
      <div class="refsect1">
        <a id="fpfastfma"></a>
        <h2>FP_FAST_FMAF and FP_FAST_FMA</h2>
        <p>
          The <code class="constant">FP_FAST_FMAF</code> macro indicates whether the
          <a class="citerefentry" href="fma.html"><span class="citerefentry"><span class="refentrytitle">fma</span></span></a> function
          is fast compared with direct code for single precision floating-point. If
          defined, the <code class="constant">FP_FAST_FMAF</code> macro shall indicate that the
          <a class="citerefentry" href="fma.html"><span class="citerefentry"><span class="refentrytitle">fma</span></span></a>() function generally
          executes about as fast as, or faster than, a multiply and an add of float operands.
        </p>
        <p>
          The <code class="constant">FP_FAST_FMA</code> macro indicates whether the
          <a class="citerefentry" href="fma.html"><span class="citerefentry"><span class="refentrytitle">fma</span></span></a> family of functions
          are fast compared with direct code for double precision floating-point. If
          defined, the <code class="constant">FP_FAST_FMA</code> macro shall indicate that the
          <a class="citerefentry" href="fma.html"><span class="citerefentry"><span class="refentrytitle">fma</span></span></a>() function generally
          executes about as fast as, or faster than, a multiply and an add of double operands.
        </p>
        <p>
          The <code class="constant">FP_FAST_FMA_HALF</code> macro indicates whether the
          <a class="citerefentry" href="fma.html"><span class="citerefentry"><span class="refentrytitle">fma</span></span></a>() family of
          functions are fast compared with direct code for half precision floating-point. If
          defined, the <code class="constant">FP_FAST_FMA_HALF</code> macro shall indicate that the
          <a class="citerefentry" href="fma.html"><span class="citerefentry"><span class="refentrytitle">fma</span></span></a>() function generally
          executes about as fast as, or faster than, a multiply and an add of half operands
        </p>
      </div>
      <div class="refsect1">
        <a id="specification"></a>
        <h2>Specification</h2>
        <p>
            <img src="pdficon_small1.gif" />

            <a href="http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf#page=252" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="mathFunctions.html"><span class="citerefentry"><span class="refentrytitle">Math Functions</span></span></a>,
            <a class="citerefentry" href="mathConstants.html"><span class="citerefentry"><span class="refentrytitle">Symbolic Math Constants</span></span></a>,
            <a class="citerefentry" href="macroLimits.html"><span class="citerefentry"><span class="refentrytitle">Macros and Limits</span></span></a>
        </p>
      </div>
      <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2011 The Khronos Group Inc.
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